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• Periodic_table abstract "The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations (electron shell model), and recurring chemical properties. Elements are presented in order of increasing atomic number (the number of protons in the nucleus). The standard form of the table consists of a grid of elements laid out in 18 columns and 7 rows, with a double row of elements below that. The table can also be deconstructed into four rectangular blocks: the s-block to the left, the p-block to the right, the d-block in the middle, and the f-block below that.The rows of the table are called periods; the columns are called groups, with some of these having names such as halogens or noble gases. Since, by definition, a periodic table incorporates recurring trends, any such table can be used to derive relationships between the properties of the elements and predict the properties of new, yet to be discovered or synthesized, elements. As a result, a periodic table—whether in the standard form or some other variant—provides a useful framework for analyzing chemical behavior, and such tables are widely used in chemistry and other sciences.Although precursors exist, Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table. Most of his predictions were proved correct when the elements in question were subsequently discovered. Mendeleev's periodic table has since been expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behavior.All elements from atomic numbers 1 (hydrogen) to 118 (ununoctium) have been discovered or reportedly synthesized, with elements 113, 115, 117, and 118 having yet to be confirmed. The first 98 elements exist naturally although some are found only in trace amounts and were synthesized in laboratories before being found in nature. Elements with atomic numbers from 99 to 118 have only been synthesized, or claimed to be so, in laboratories. Production of elements having higher atomic numbers is being pursued, with the question of how the periodic table may need to be modified to accommodate any such additions being a matter of ongoing debate. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.".
• Periodic_table thumbnail Periodic_table_(polyatomic).svg?width=300.
• Periodic_table wikiPageExternalLink weird-words-of-science-lemniscate.html.
• Periodic_table wikiPageExternalLink Periodic_Table.jpg.
• Periodic_table wikiPageExternalLink chemici2.html.
• Periodic_table wikiPageExternalLink pt_database.php.
• Periodic_table wikiPageExternalLink pt_database.php?PT_id=360.
• Periodic_table wikiPageExternalLink pt_database.php?PT_id=456.
• Periodic_table wikiPageExternalLink the-periodic-table.html.
• Periodic_table wikiPageExternalLink www.periodicvideos.com.
• Periodic_table wikiPageExternalLink www.ptable.com.
• Periodic_table wikiPageExternalLink www.webelements.com.
• Periodic_table wikiPageID "23053".
• Periodic_table wikiPageRevisionID "606812116".
• Periodic_table hasPhotoCollection Periodic_table.
• Periodic_table subject Category:Classification_systems.
• Periodic_table subject Category:Dmitri_Mendeleev.
• Periodic_table subject Category:Periodic_table.
• Periodic_table subject Category:Russian_inventions.
• Periodic_table comment "The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic numbers, electron configurations (electron shell model), and recurring chemical properties. Elements are presented in order of increasing atomic number (the number of protons in the nucleus). The standard form of the table consists of a grid of elements laid out in 18 columns and 7 rows, with a double row of elements below that.".
• Periodic_table label "Periodensystem".
• Periodic_table label "Periodic table".
• Periodic_table label "Periodiek systeem".
• Periodic_table label "Tabela periódica".
• Periodic_table label "Tabla periódica de los elementos".
• Periodic_table label "Tableau périodique des éléments".
• Periodic_table label "Tavola periodica degli elementi".
• Periodic_table label "Układ okresowy pierwiastków".
• Periodic_table label "Периодическая система химических элементов".
• Periodic_table label "جدول دوري".
• Periodic_table label "元素周期表".
• Periodic_table label "周期表".
• Periodic_table sameAs Periodická_tabulka.
• Periodic_table sameAs Periodensystem.
• Periodic_table sameAs Περιοδικός_πίνακας_των_χημικών_στοιχείων.
• Periodic_table sameAs Tabla_periódica_de_los_elementos.
• Periodic_table sameAs Taula_periodikoa.
• Periodic_table sameAs Tableau_périodique_des_éléments.
• Periodic_table sameAs Tabel_periodik.
• Periodic_table sameAs Tavola_periodica_degli_elementi.
• Periodic_table sameAs 周期表.
• Periodic_table sameAs 주기율표.
• Periodic_table sameAs Periodiek_systeem.
• Periodic_table sameAs Układ_okresowy_pierwiastków.
• Periodic_table sameAs Tabela_periódica.
• Periodic_table sameAs m.05rbs.
• Periodic_table sameAs Mx4rv_VCjJwpEbGdrcN5Y29ycA.
• Periodic_table sameAs Q10693.
• Periodic_table sameAs Q10693.
• Periodic_table wasDerivedFrom Periodic_table?oldid=606812116.
• Periodic_table depiction Periodic_table_(polyatomic).svg.
• Periodic_table isPrimaryTopicOf Periodic_table.